Measuring mass fraction of transparent liquid using equal thickness interference
Based on the principle of equal thickness interference,an automatic measuring device for mass fraction of transparent liquid was designed.An ordinary optical glass was used as the upper interference plate,and a semi-transparent and semi-reflective mirror was used as the lower interfer-ence plate,thus a small angle wedge tip was built.CCD was used to photograph the interference fringe patterns formed at the air gap in the wedge tip and the gap filled with the solution.The inter-ference pattern was processed by gray level conversion,median filtering,mean filtering and fuzzy pro-cessing,and the refractive index of the solution was calculated by Matlab software,and then the mass fraction of the transparent liquid was calculated by the refractive index.
mass fractionrefractive indexequal thickness interferencewedge tipimage pro-cessing
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